Upon confirmation of inclusion into the study, subjects will then be given appointments for cognitive testing and further clinical assessments by the study independent evaluator. The Mini International Neuropsychiatric Interview for DSM-IV (M.I.N.I.; Sheehan & Lecrubier et al., 1998) will be used to determine comorbid disorders that are excluded from the study, which will take approximately 45 minutes to complete. The Wechsler Adult Intelligence Scale - Third Edition (WAIS-III; Wechsler 1997), which is an instrument that assesses verbal and nonverbal intellectual functioning, will be used to determine subjects' cognitive capacity, and will take approximately 90-120 minutes to complete.